NVMe Reservation Proxy for Multi-Host Storage
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Solution Overview
Problem
In multi-host storage systems, managing reservations for access to shared storage devices across multiple communication stages with different protocols poses challenges, including compatibility issues and coordinated communication complexities, which can lead to data corruption if not managed properly.
Innovation Solution
A method is introduced to modify reservations at a first stage and tie them to another logical unit at the storage drive, using a reservation proxy to translate and modify reservation commands, ensuring compatibility and coordinated access across different stages and protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reservations are managed across multiple communication stages with different protocols, then storage device access coordination is achieved, but protocol compatibility issues and communication complexity increase
Solution Approach 1:
A reservation proxy is introduced as an intermediary component between the first stage (host controller) and second stage (storage device). The proxy receives reservation commands from the first stage, translates them into appropriate protocols for the second stage, and manages the reservation state. This intermediary resolves protocol incompatibility between different stages while maintaining data integrity through coordinated reservation management.
2Adaptability or versatility
If protocol translation is implemented between stages, then compatibility is improved, but processing overhead increases
Solution Approach 1:
The reservation proxy is configured with pre-established protocol translation rules and mappings between different communication protocols. Common protocol translations are prepared in advance, allowing the proxy to quickly translate reservation commands without performing complex real-time protocol analysis. This preliminary preparation reduces processing overhead while maintaining broad protocol compatibility.
3Productivity
If multiple host controllers access shared storage devices, then system availability is improved, but reservation management complexity increases
Solution Approach 1:
The reservation proxy serves as a centralized mediator that receives reservation requests from multiple host controllers, maintains a unified reservation state for shared storage devices, and coordinates access among competing hosts. This single point of control simplifies reservation management complexity while enabling multiple hosts to access storage devices with improved system availability through proper arbitration.
Data Source
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AI summary
A method includes receiving, by a storage drive and from a storage controller, a modified first reservation command including a first logical unit identifier. The first reservation command includes a first host identifier to identify a first host controller was previously received by the storage controller from the first host controller. The first reservation command was modified by the storage controller to replace the first host identifier with the first logical unit identifier. The method also includes responsive to receiving the modified first reservation command, identifying, by the storage drive, a first logical unit of storage based on the first logical unit identifier of the modified reservation command. The method includes granting, by the storage drive, a reservation for access to the storage drive on behalf of the first host controller by associating the reservation for the first logical unit with a second logical unit of storage.